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United States Patent  [ii] Patent Number: 5,397,286
Chang  Date of Patent: Mar. 14,1995
 EXERCISE BICYCLE
 Inventor: Chi-Ming Chang, Taichung Hsien, Taiwan, Prov. of China
 Assignee: Giant Manufacturing Co., Ltd.,
Taichung Hsien, Taiwan, Prov. of
 Appl. No.: 283,062
 Filed: Jul. 28,1994
Related U.S. Application Data
 Continuation of Ser. No. 166,728, Dec. 14, 1993, abandoned.
 Int. CI.* A63B 21/00
 U.S. CI 482/62; 482/59
 Field of Search 482/57, 59, 62, 63
 References Cited
U.S. PATENT DOCUMENTS
2,419,998 5/1947 Johnson .
4,436,097 3/1984 Cunningham .
4,657,244 4/1987 Ross .
4,705,269 11/1987 DeBoeretal. .
4.712.789 12/1987 Brilando 482/62
4.712.790 12/1987 Szymski 482/62
4,838,544 6/1989 Sasakawa et al 482/62
4,895,362 1/1990 Ross .
4,902,001 2/1990 Balbo .
5,035,417 7/1991 Ross .
FOREIGN PATENT DOCUMENTS 517774 of 0000 Germany .
Primary Examiner—Stephen R. Crow
Attorney, Agent, or Firm—Harness, Dickey & Pierce
The transmission system of an exercise bicycle includes a first drive shaft mounted rotatably on the rear end portion of a frame and provided with foot pedal cranks on two ends thereof, second and third drive shafts mounted rotatably on the frame, a one-way clutch secured on the second drive shaft, a first sprocket mounted securely on the first drive shaft, second and third sprockets mounted securely on the second drive shaft, a fourth sprocket mounted securely on the third drive shaft, a fifth sprocket mounted securely on an axle of a resistance wheel that is mounted rotatably on a front end portion of the frame, a first drive chain trained between the first sprocket and the one-way clutch, a second drive chain trained between the second and fifth sprockets, and a third drive chain trained between the third and fourth sprockets. The exercise bicycle has a reciprocating arm assembly which includes a pair of reciprocating arm levers mounted pivotally on the front end portion of the frame and a pair of crank arms, each of which having a first end connected pivotally to a lower end of a respective one of the arm levers and a second end connected eccentrically to a respective end of the third drive shaft.
1 Claim, 6 Drawing Sheets